using System;

using Org.BouncyCastle.Asn1;

namespace Org.BouncyCastle.Asn1.Cms
{
	public class OriginatorInfo
		: Asn1Encodable
	{
		private Asn1Set certs;
		private Asn1Set crls;

		public OriginatorInfo(
			Asn1Set certs,
			Asn1Set crls)
		{
			this.certs = certs;
			this.crls = crls;
		}

		public OriginatorInfo(
			Asn1Sequence seq)
		{
			switch (seq.Count)
			{
			case 0:     // empty
				break;
			case 1:
				Asn1TaggedObject o = (Asn1TaggedObject) seq[0];
				switch (o.TagNo)
				{
				case 0 :
					certs = Asn1Set.GetInstance(o, false);
					break;
				case 1 :
					crls = Asn1Set.GetInstance(o, false);
					break;
				default:
					throw new ArgumentException("Bad tag in OriginatorInfo: " + o.TagNo);
				}
				break;
			case 2:
				certs = Asn1Set.GetInstance((Asn1TaggedObject) seq[0], false);
				crls  = Asn1Set.GetInstance((Asn1TaggedObject) seq[1], false);
				break;
			default:
				throw new ArgumentException("OriginatorInfo too big");
			}
		}

		/**
		 * return an OriginatorInfo object from a tagged object.
		 *
		 * @param obj the tagged object holding the object we want.
		 * @param explicitly true if the object is meant to be explicitly
		 *              tagged false otherwise.
		 * @exception ArgumentException if the object held by the
		 *          tagged object cannot be converted.
		 */
		public static OriginatorInfo GetInstance(
			Asn1TaggedObject	obj,
			bool				explicitly)
		{
			return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
		}

		/**
		 * return an OriginatorInfo object from the given object.
		 *
		 * @param obj the object we want converted.
		 * @exception ArgumentException if the object cannot be converted.
		 */
		public static OriginatorInfo GetInstance(
			object obj)
		{
			if (obj == null || obj is OriginatorInfo)
				return (OriginatorInfo)obj;

			if (obj is Asn1Sequence)
				return new OriginatorInfo((Asn1Sequence)obj);

			throw new ArgumentException("Invalid OriginatorInfo: " + obj.GetType().Name);
		}

		public Asn1Set Certificates
		{
			get { return certs; }
		}

		public Asn1Set Crls
		{
			get { return crls; }
		}

		/**
		 * Produce an object suitable for an Asn1OutputStream.
		 * <pre>
		 * OriginatorInfo ::= Sequence {
		 *     certs [0] IMPLICIT CertificateSet OPTIONAL,
		 *     crls [1] IMPLICIT CertificateRevocationLists OPTIONAL
		 * }
		 * </pre>
		 */
		public override Asn1Object ToAsn1Object()
		{
			Asn1EncodableVector v = new Asn1EncodableVector();

			if (certs != null)
			{
				v.Add(new DerTaggedObject(false, 0, certs));
			}

			if (crls != null)
			{
				v.Add(new DerTaggedObject(false, 1, crls));
			}

			return new DerSequence(v);
		}
	}
}
